I am a prime number.
The double of myself is equal to the square of me.

which number am I?

Complete the table series riddle by finding the number that can replace "??".

Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

If a zookeeper had 100 pairs of animals in her zoo, and two pairs of babies are born for each one of the original animals, then (sadly) 23 animals don’t survive, how many animals do you have left in total?

A landlord calls both of his sons and tells them that their horses will now decide who will transfer the inheritance. He tells them to race along the land till the end and the one whose horse will be slower will win and be the heir to all the property.

Both of them keep wandering for days but to no result. Then they ask a wise man regarding it. The man advises them on the matter after which they jump on the horses and race as fast as they can till the end. Why did they do it?

What did the wise man say?

Count the number of balls in picture below:

Assume there are approximately 5,000,000,000 (5 billion) people on Earth. What would you estimate to be the result, if you multiply together the number of fingers on every person's left hand? (For the purposes of this exercise, thumbs count as fingers, for five fingers per hand.) If you cannot estimate the number then try to guess how long the number would be.

Count the number of triangles in the picture below:

Can you identify the direction in which this bus is moving; left or right?

Hint: The bus is moving on the roads of London.

Can you make numbers like 24, using numbers 3,3,7 & 7 with any arithmetic operator?